import java.util.*
 
fun main(args: Array<String>) {
    val sc = Scanner(System.`in`)
    val n = sc.nextInt()
    val sb = StringBuilder()
    val stack = Stack<Int>()
    var current = 1
 
    repeat(n) {
        val num = sc.nextInt()
        while (current <= n) {
            if (stack.isNotEmpty() && stack.peek() == num) {
                stack.pop()
                sb.append("-\n")
                break
            } else {
                stack.push(current)
                sb.append("+\n")
                current++
            }
        }
    }
 
    if (stack.isNotEmpty()) {
        println("NO")
    } else {
        println(sb)    
    }
}

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4
3
6
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5
2
1